Ruling attachment for triangles



S. DI MAIO.

RULING ATTACHMENT FOR TRIANGLES.

APPLICATION FILED DEC-3. I9l8.

1 ,3 1 3, 1 68, Patented Aug. 12, 1919.

' 0 Zrg. 5.

Y .3 WITNESSES INVENTOR 21 "Z6 51mm: 0/ Mme. BY 3 g 'W' ATTORNY8 UNITED STATES PATENT OFFICE.

SIMONE DI MAIO, or vnw YORK, 1v. Y.

RULING- ATTACHMENT FOR TRIANGLES.

The invention relates to drafting implements and its object is to provide a new and improved ruling attachment for triangles arranged to enable the user to readily and accurately draw parallel lines especially section lines. Another object is to permit the user to adjust the ruling attachment for drawing parallel lines spaced varying distances apart. Another object is to provide an extension for the triangle.

With these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and de scribed and then specifically pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a plan view of the ruling attachment secured to a triangle to form an extension thereof, the triangle and the ruling attachment being shown in position on a drawing board;

Fig. 2 is a plan view of the ruling attachment applied to a triangle and with the parts in position for drawing parallel lines;

Fig. 3 isia section of the same on the line 3 e of Fig. 2;

Fig. 4 is a section of the same on the line 44 of Fig. 2; and

Figs. 5 and 6 are edge views of the two adjustable members of the ruling attachment.

The ruling attachment is in the form of a straight edge 10 arranged to coact with the side 11 of a right-angled triangle 12 having the sides 13 and 14 forming the right angle. The straight edge 10 is preferably made in two sections 15 and 16 slida'ble one on the other to lengthen or shorten the straight edge. For the purpose mentioned the sec tion 16 is provided with a screw 17 which extends through a slot 18 formed lengthwise on the section 15, and on the set screw 17 screws a clamping nut 19 adapted to engage Specification of Letters Patent.

Patented Aug. 12, 1919.

Application filed December 3, 1918. Serial No. 265,159.

the section 15 to clamp the two sections 15 and 16 together after the said sections are adjusted lengthwise to the desired position. The ends of the sections 15 and 16 are provided with arms 20 and 21' having depend ing pins or lugs'22, 23 at their free ends, and the said pins are adapted to engageapertures 24, 25 arranged in two rows lengthwise on the sides 13 and 14 of the triangle 12. By the arrangement described the pins 22, 23 can lbe engaged with anyone of the apertures 24, 2 5 to hold the straight edge 10 close to the side 11 or spaced therefrom in parallelism, as will be readily understood by reference to Figs. 1 and 2. The outer ends 30 and 31 of the sections 15 and 16 are heveled and in alinement with the sides 13 and 14 so that the straight edge 10 forms an extension of the triangle 12.

When the straight edge 10 is held spaced from the side 11 of the triangle 12, as shown in Fi 2, then the user can readily use the triang e and its ruling attachment on the drawing paper 40 held on a drawing board engaged by a T square 42 on which latter rests the triangle and the straight edge to permit the user to draw parallel lines one along the side 11 and one along the inner side of the straight edge 10. In order to draw the next parallel lines spaced the same distance apart the operator shifts the tringle and its attachment say to the right until the inner side of the straight edge 10 coincides with the line drawn along the side 11. The artist now draws the third line along the side 11 and this operation is repeated as many times as necessary for drawing a. desired number of parallel lines all spaced equal distances apart.

It is understood that by engaging the pin 22, 23 with either of the apertures 24, 25 the straight edge is spaced from the side 11 a desired distance for drawing the parallel lines a corresponding distance apart. When the ruling attachment is not to be used, its arms 20 and 21 are readily disengaged from the triangle 12 to allow of using the latter without the attachment.

The ruling attachment shown and described is very simple in construction and can be readily attached to or removed from the triangle, it being understood that any ordinary triangle may be used by providing the same with the rows of apertures 24, 25.

It will be noticed that the section lines previously drawn are covered up by the straight edge and hence such lines do not confuse the draftsman in drawing the suc- Cessive lines.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A ruling device, comprising a triangle having apertures, a straight edge, and arms held on the straight edge and provided with pins engaging the said apertures to hold the straight edge in parallelism with one of the sides of the triangle.

2. A ruling device, comprising a triangle, a straight edge made in sections adjustable one on the other, the edges of the straight edge being parallel with one side of the triangle and the ends of the straight edge be ing in alineinent with the other two sides of the triangle, and means connecting the said straight edge to the triangle.

3. A ruling device, comprising a triangle, a straight edge made in sect-ions adjustable one on the other, the edges of the straight edge being parallel with one side of the triangle and the ends of the straight edge being in alinenient with the other two sides of the triangle, and arms attached to the outer ends of the said straight edge sec tions, the said arms having pins and the said triangle having rows of apertures parallel with the said other two sides of the triangle and being engaged bythe said pins to hold the straight edge in parallelism with the base of the triangle.

SIMONE DI MAIO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D; G. 

